A congruence subgroup property for symmetric mapping class groups

preprint2026arXivOpen access

Abstract

We prove the congruence subgroup property for the centralizer of a finite subgroup GG in the mapping class group of a hyperbolic oriented and connected surface of finite topological type SS such that the genus of the quotient surface S/GS/G is at most 22. As an application, we show that torsion elements in the mapping class group of a surface of genus ≤2\leq 2 are conjugacy distinguished.

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